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jeremybenn |
/* is-xor-test.S. l.xor and l.xori instruction test of Or1ksim
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*
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* Copyright (C) 1999-2006 OpenCores
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* Copyright (C) 2010 Embecosm Limited
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*
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* Contributors various OpenCores participants
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* Contributor Jeremy Bennett
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*
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* This file is part of OpenRISC 1000 Architectural Simulator.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see .
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*/
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/* ----------------------------------------------------------------------------
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* Coding conventions are described in inst-set-test.S
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* ------------------------------------------------------------------------- */
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/* ----------------------------------------------------------------------------
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* Test coverage
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*
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* The l.xor and l.xori instructions should never set the carry and overflow
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* flags.
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*
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* Problems in this area were reported in Bugs 1782, 1783 and 1784. Having
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* fixed the problem, this is (in good software engineering style), a
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* regression test to go with the fix.
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*
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* This is not a comprehensive test of any instruction (yet).
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*
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* Of course what is really needed is a comprehensive instruction test...
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* ------------------------------------------------------------------------- */
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#include "inst-set-test.h"
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/* A macro to sign extend a 16-bit value */
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#define SE(v) (v | ((v & 0x8000) << 1) | \
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((v & 0x8000) << 2) | \
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((v & 0x8000) << 3) | \
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((v & 0x8000) << 4) | \
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((v & 0x8000) << 5) | \
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((v & 0x8000) << 6) | \
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((v & 0x8000) << 7) | \
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((v & 0x8000) << 8) | \
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((v & 0x8000) << 9) | \
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((v & 0x8000) << 10) | \
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((v & 0x8000) << 11) | \
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((v & 0x8000) << 12) | \
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((v & 0x8000) << 13) | \
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((v & 0x8000) << 14) | \
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((v & 0x8000) << 15) | \
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((v & 0x8000) << 16) )
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/* ----------------------------------------------------------------------------
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* A macro to carry out a test of bitwise XOR in registers
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*
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* This opcode should never set the flags. Result is compared with the native
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* computed value.
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*
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* Arguments
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* op1: First operand value
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* op2: Second operand value
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* ------------------------------------------------------------------------- */
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#define TEST_XOR(op1, op2) \
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l.mfspr r3,r0,SPR_SR /* Clear flags */ ;\
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LOAD_CONST (r2, ~(SPR_SR_CY | SPR_SR_OV)) ;\
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l.and r3,r3,r2 ;\
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l.mtspr r0,r3,SPR_SR ;\
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;\
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LOAD_CONST (r5,op1) /* Load operands */ ;\
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LOAD_CONST (r6,op2) ;\
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l.mtspr r0,r0,SPR_EPCR_BASE /* Clear record */ ;\
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50: l.xor r4,r5,r6 ;\
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l.mfspr r2,r0,SPR_SR /* So we can examine flags */ ;\
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l.mfspr r5,r0,SPR_EPCR_BASE /* What triggered exception */ ;\
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PUSH (r5) /* Save EPCR for later */ ;\
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PUSH (r2) /* Save SR for later */ ;\
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PUSH (r4) /* Save result for later */ ;\
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;\
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PUTS (" 0x") ;\
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PUTH (op1) ;\
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PUTS (" ^ 0x") ;\
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PUTH (op2) ;\
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PUTS (" = 0x") ;\
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PUTH (op1 ^ op2) ;\
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PUTS (": ") ;\
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POP (r4) ;\
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CHECK_RES1 (r4, op1 ^ op2) ;\
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;\
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POP(r2) /* Retrieve SR */ ;\
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PUSH(r2) ;\
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LOAD_CONST (r4, SPR_SR_CY) /* The carry bit */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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CHECK_FLAG ("- carry flag set: ", FALSE) ;\
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;\
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POP(r2) /* Retrieve SR */ ;\
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LOAD_CONST (r4, SPR_SR_OV) /* The overflow bit */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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CHECK_FLAG ("- overflow flag set: ", FALSE) ;\
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;\
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POP (r2) /* Retrieve EPCR */ ;\
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LOAD_CONST (r4, 50b) /* The opcode of interest */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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l.bnf 51f ;\
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;\
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PUTS (" - exception triggered: TRUE\n") ;\
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l.j 52f ;\
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l.nop ;\
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;\
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51: PUTS (" - exception triggered: FALSE\n") ;\
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52:
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/* ----------------------------------------------------------------------------
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* A macro to carry out a test of bitwise XOR with an immediate operand
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*
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* This opcode should never set the flags. Result is compared with the native
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* computed value. Note that the OR1K architecture specfies that the immediate
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* operand is sign-extended, not zero-extended.
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*
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* Arguments
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* op1: First operand value
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* op2: Second operand value
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* ------------------------------------------------------------------------- */
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#define TEST_XORI(op1, op2) \
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l.mfspr r3,r0,SPR_SR /* Clear flags */ ;\
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LOAD_CONST (r2, ~(SPR_SR_CY | SPR_SR_OV)) ;\
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l.and r3,r3,r2 ;\
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l.mtspr r0,r3,SPR_SR ;\
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;\
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LOAD_CONST (r5,op1) /* Load operands */ ;\
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l.mtspr r0,r0,SPR_EPCR_BASE /* Clear record */ ;\
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53: l.xori r4,r5,op2 ;\
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l.mfspr r2,r0,SPR_SR /* So we can examine flags */ ;\
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l.mfspr r5,r0,SPR_EPCR_BASE /* What triggered exception */ ;\
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PUSH (r5) /* Save EPCR for later */ ;\
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PUSH (r2) /* Save SR for later */ ;\
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PUSH (r4) /* Save result for later */ ;\
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;\
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PUTS (" 0x") ;\
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PUTH (op1) ;\
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PUTS (" ^ 0x") ;\
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PUTHH (op2) ;\
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PUTS (" = 0x") ;\
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PUTH (op1 ^ SE (op2)) ;\
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PUTS (": ") ;\
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POP (r4) ;\
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CHECK_RES1 (r4, op1 ^ SE (op2)) ;\
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;\
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POP(r2) /* Retrieve SR */ ;\
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PUSH(r2) ;\
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LOAD_CONST (r4, SPR_SR_CY) /* The carry bit */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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CHECK_FLAG ("- carry flag set: ", FALSE) ;\
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;\
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POP(r2) /* Retrieve SR */ ;\
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LOAD_CONST (r4, SPR_SR_OV) /* The overflow bit */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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CHECK_FLAG ("- overflow flag set: ", FALSE) ;\
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;\
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POP (r2) /* Retrieve EPCR */ ;\
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LOAD_CONST (r4, 53b) /* The opcode of interest */ ;\
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l.and r2,r2,r4 ;\
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l.sfeq r2,r4 ;\
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l.bnf 54f ;\
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;\
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PUTS (" - exception triggered: TRUE\n") ;\
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l.j 55f ;\
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l.nop ;\
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;\
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54: PUTS (" - exception triggered: FALSE\n") ;\
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55:
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/* ----------------------------------------------------------------------------
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* Start of code
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* ------------------------------------------------------------------------- */
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.section .text
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.global _start
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_start:
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/* Always set OVE. We should never trigger an exception, even if this
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bit is set. */
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l.mfspr r3,r0,SPR_SR
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LOAD_CONST (r2, SPR_SR_OVE) /* Set OVE */
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l.or r3,r3,r2
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l.mtspr r0,r3,SPR_SR
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LOAD_STR (r3, " ** OVE flag set **\n")
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l.jal _puts
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l.nop
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/* ----------------------------------------------------------------------------
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* Test of xor, l.xor
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* ------------------------------------------------------------------------- */
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_xor:
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LOAD_STR (r3, "l.xor\n")
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l.jal _puts
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l.nop
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/* Test a range of operands */
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TEST_XOR (0x00000000, 0x00000000)
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TEST_XOR (0xffffffff, 0xffffffff)
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TEST_XOR (0xaaaaaaaa, 0x00000000)
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TEST_XOR (0xaaaaaaaa, 0xaaaaaaaa)
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TEST_XOR (0x55555555, 0x00000000)
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TEST_XOR (0x55555555, 0x55555555)
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TEST_XOR (0xaaaaaaaa, 0x55555555)
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TEST_XOR (0x4c70f07c, 0xb38f0f83)
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TEST_XOR (0x4c70f07c, 0xc4c70f07)
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TEST_XOR (0xb38f0f83, 0x38f0f83b)
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/* ----------------------------------------------------------------------------
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* Test of xor with immediate half word, l.xori
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* ------------------------------------------------------------------------- */
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_xori:
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LOAD_STR (r3, "l.xori\n")
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l.jal _puts
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l.nop
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/* Test a range of operands */
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TEST_XORI (0x00000000, 0x0000)
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TEST_XORI (0xffffffff, 0xffff)
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TEST_XORI (0xaaaaaaaa, 0x0000)
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TEST_XORI (0xaaaaaaaa, 0xaaaa)
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TEST_XORI (0x55555555, 0x0000)
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TEST_XORI (0x55555555, 0x5555)
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TEST_XORI (0xaaaaaaaa, 0x5555)
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TEST_XORI (0x4c70f07c, 0x0f83)
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TEST_XORI (0x4c70f07c, 0x0f07)
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TEST_XORI (0xb38f0f83, 0xf83b)
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/* ----------------------------------------------------------------------------
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* All done
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* ------------------------------------------------------------------------- */
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_exit:
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LOAD_STR (r3, "Test completed\n")
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l.jal _puts
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l.nop
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TEST_EXIT
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